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What is more, we hear about the medicinal properties of marijuana for various major or minor ailments, eg Epilepsy, Alzheimer's, depression and even cancer.
Link to an interesting article
https://www.alzheimers.net/6-15-15-effects-of-medical-marijuana-on-alzheimers/

So why was it only legalized in several countries, including the USA (several states).
The answer can be very simply legalize marijuana is less profitable than pharmaceutical concerns that sell medicines for diseases that could possibly cure only one Marijuana drug.